Abstract
A first-order phase transition in the mixed monolayer of ethylene glycol mono-n-dodecyl ether (EGDE) and sodium 3,6,9,12-tetraoxaoctacosanoate (TOOCNa) has been studied by Brewster angle microscopy (BAM) at an EGDE/TOOCNa molar ratio of 3:2. From the study of surface tension as a function of mole fraction, it has been found that at this molar ratio the surfactant mixture shows the maximum surface activity. A cusp point followed by a plateau region with subsequent formation of bright two-dimensional condensed domains in a dark background visualized by BAM indicates the first-order phase transition. The appearance of the cusp point shifts to early time upon mixing TOOCNa with EGDE. The patterns of the adsorption kinetics and surface morphology of the mixed monolayers differ from those of pure systems. For the pure EGDE monolayer, the condensed domains are of a fingering pattern whereas those for the mixed monolayer are circular, indicating that the condensed domains are formed from both of the surfactants. ...
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